Sport is a very difficult type of human activity that requires the full commitment athlete, is, he must become way life. Particular attention in sports paid to results, namely their improvement, cross-country skiing no exception. Because they are considered one most massive and complex species. Recently, at competitions different levels there great complication conditions competition tracks, ac...

the perceived success of AI in business applications. Great early success allowed AAAI to weather the ”AI winter“ to enjoy the current “thaw.” Other challenges to AAAI have resulted from its success in spinning out international conferences, thereby effectively removing several key AI areas from the AAAI National Conference. AAAI leadership continues to look for ways to deal with these challenges.

By means of an event study of stock market reactions to the announcement of the Olympic Games host cities, we find a significant and positive announcement effect of hosting the Summer Games, with a cumulative abnormal return of about 2% within a few days. We do not find any significant results for the Winter Games. Neither do we detect a significant impact when bidders lose the competition. Our...